/*
 * Copyright (C) 2012 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package interactivespaces.controller.client.node.ros;

import interactivespaces.activity.ActivityStatus;
import interactivespaces.controller.client.node.ActiveControllerActivity;

/**
 * Listeners for events from the {@link SpaceControllerActivityWatcher}.
 *
 * @author Keith M. Hughes
 */
public interface SpaceControllerActivityWatcherListener {

	/**
	 * The status of the given activity has changed.
	 * 
	 * <p>
	 * The change is not an error.
	 * 
	 * @param activity
	 * 		The activity whose status has changed.
	 * @param oldStatus
	 * 		The status the activity had before the change
	 * @param newStatus
	 * 		The status of the activity after the change.
	 */
	void onWatcherActivityStatusChange(ActiveControllerActivity activity, 
		ActivityStatus oldStatus, ActivityStatus newStatus);
	
	/**
	 * An activity has had an error.
	 * 
	 * @param activity
	 * 		The activity whose status has changed.
	 * @param oldStatus
	 * 		The status the activity had before the change
	 * @param newStatus
	 * 		The status of the activity after the change.
	 */
	void onWatcherActivityError(ActiveControllerActivity activity, 
			ActivityStatus oldStatus, ActivityStatus newStatus);
}
